Buggy code:
testNum = 21 ; testingWhat = "indexOf<seq2seq4repair_space>an<seq2seq4repair_space>item" ; expectedInt = 0 ; actualInt = stringList1 . indexOf ( "X" ) ; testResults = ( expectedInt == actualInt ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; testNum = 22 ; testingWhat = "indexOf<seq2seq4repair_space>an<seq2seq4repair_space>item" ; expectedInt = 2 ; actualInt = stringList1 . indexOf ( "Q" ) ; testResults = ( expectedInt == actualInt ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; testNum = 23 ; testingWhat = "indexOf<seq2seq4repair_space>an<seq2seq4repair_space>item<seq2seq4repair_space>in<seq2seq4repair_space>a<seq2seq4repair_space>range<seq2seq4repair_space>that<seq2seq4repair_space>does<seq2seq4repair_space>contain<seq2seq4repair_space>it" ; expectedInt = 1 ; actualInt = stringList1 . indexOf ( "w" , 1 ) ; testResults = ( expectedInt == actualInt ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; testNum = 24 ; testingWhat = "indexOf<seq2seq4repair_space>an<seq2seq4repair_space>item<seq2seq4repair_space>in<seq2seq4repair_space>a<seq2seq4repair_space>range<seq2seq4repair_space>that<seq2seq4repair_space>doesn't<seq2seq4repair_space>contain<seq2seq4repair_space>it" ; expectedInt = - 1 ; actualInt = stringList1 . indexOf ( "w" , 2 ) ; testResults = ( expectedInt == actualInt ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; stringList1 . insert ( 0 , "z" ) ; stringList1 . insert ( 3 , "M" ) ; stringList1 . insert ( 5 , "P" ) ; testNum = 25 ; testingWhat = "several<seq2seq4repair_space>inserts" ; expectedString = "[z,<seq2seq4repair_space>X,<seq2seq4repair_space>w,<seq2seq4repair_space>M,<seq2seq4repair_space>Q,<seq2seq4repair_space>P]" ; actualString = stringList1 . toString ( ) ; testResults = ( expectedString . equals ( actualString ) ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; testNum = 26 ; testingWhat = "size()<seq2seq4repair_space>after<seq2seq4repair_space>inserts" ; expectedInt = 6 ; actualInt = stringList1 . size ( ) ; testResults = ( expectedInt == actualInt ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; stringList1 . add ( "\\m\\{o\\p" ) ; testNum = 27 ; testingWhat = "remove(\"\\m\\{o\\p\")" ; expectedBool = true ; actualBool = stringList1 . remove ( "\\m\\{o\\p" ) ; expectedString = "[z,<seq2seq4repair_space>X,<seq2seq4repair_space>w,<seq2seq4repair_space>M,<seq2seq4repair_space>Q,<seq2seq4repair_space>P]" ; actualString = stringList1 . toString ( ) ; testResults = ( ( expectedString . equals ( actualString ) ) && ( expectedBool == actualBool ) ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; testNum = 28 ; testingWhat = "remove(\"P\")" ; expectedBool = true ; actualBool = stringList1 . remove ( "P" ) ; expectedString = "[z,<seq2seq4repair_space>X,<seq2seq4repair_space>w,<seq2seq4repair_space>M,<seq2seq4repair_space>Q]" ; actualString = stringList1 . toString ( ) ; testResults = ( ( expectedString . equals ( actualString ) ) && ( expectedBool == actualBool ) ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; stringList2 . makeEmpty ( ) ; stringList2 . add ( stringList1 . remove ( 4 ) ) ; stringList2 . add ( stringList1 . remove ( 2 ) ) ; stringList2 . add ( stringList1 . removeFirst ( ) ) ; stringList2 . add ( stringList1 . removeLast ( ) ) ; testNum = 29 ; testingWhat = "removeFirst,<seq2seq4repair_space>removeLast,<seq2seq4repair_space>remove(pos)" ; expectedString = "[Q,<seq2seq4repair_space>w,<seq2seq4repair_space>z,<seq2seq4repair_space>M]" ; actualString = stringList2 . toString ( ) ; testResults = ( expectedString . equals ( actualString ) ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; stringList2 . removeRange ( 0 , 0 ) ; testNum = 30 ; testingWhat = "removeRange(start,<seq2seq4repair_space>stop)" ; <START_BUG> expectedString = "[w,<seq2seq4repair_space>z,<seq2seq4repair_space>M]" ; <END_BUG> actualString = stringList2 . toString ( ) ; testResults = ( expectedString . equals ( actualString ) ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; stringList2 . removeRange ( 0 , stringList2 . size ( ) ) ; testNum = 31 ; testingWhat = "removeRange(start,<seq2seq4repair_space>stop)" ; expectedString = "[]" ; actualString = stringList2 . toString ( ) ; testResults = ( expectedString . equals ( actualString ) ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; testNum = 32 ; testingWhat = "size()<seq2seq4repair_space>after<seq2seq4repair_space>removes" ; expectedInt = 1 ; actualInt = stringList1 . size ( ) ; testResults = ( expectedInt == actualInt ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; testNum = 33 ; testingWhat = "size()<seq2seq4repair_space>after<seq2seq4repair_space>removes" ; expectedInt = 0 ; actualInt = stringList2 . size ( ) ; testResults = ( expectedInt == actualInt ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; charList1 . add ( 'Q' ) ; charList1 . add ( 'P' ) ; charList1 . add ( 'm' ) ; charList1 . set ( ( ( charList1 . size ( ) ) - 1 ) , 'n' ) ; testNum = 34 ; testingWhat = "set" ; expectedString = "[s,<seq2seq4repair_space>Q,<seq2seq4repair_space>P,<seq2seq4repair_space>n]" ; actualString = charList1 . toString ( ) ; testResults = ( expectedString . equals ( actualString ) ) ? LinkedListTester . PASSED_TEST : LinkedListTester . FAILED_TEST ; System . out . println ( LinkedListTester . formattedTestResults ( testNum , testingWhat , testResults ) ) ; charList1 . set ( 0 , 'W' ) ; testNum = 35 ; testingWhat = "set" ;

Fix:
expectedString = "[Q,<seq2seq4repair_space>w,<seq2seq4repair_space>z,<seq2seq4repair_space>M]" ;